body {
  background-color: #f4f5f5;
}

.nav {
  line-height: 60px;
  padding: 0 50px;
  background-color: #fff;
}

.content {
  margin: 10px 70px;
}

a {
  color: #71777c;
  margin: 0 20px;
}


a.active {
  color: #007fff;
}